What is the 24 hour rule for British Airways?

Your right to cancel within 24 hours {+𝟏-𝟖𝟕𝟕-𝟔𝟗𝟑-𝟒𝟗𝟕𝟕 (𝑼𝑺𝑨)}}

If you have booked directly with British Airways {+𝟒𝟒 𝟖𝟎𝟖 𝟏𝟎𝟏 𝟏𝟓𝟓𝟒 (𝑼𝑲)} you can cancel your flight booking and claim a full refund without penalty, {+𝟏-𝟖𝟕𝟕-𝟔𝟗𝟑-𝟒𝟗𝟕𝟕 (𝑼𝑺𝑨)}}up to 24 hours from {+𝟒𝟒 𝟖𝟎𝟖 𝟏𝟎𝟏 𝟏𝟓𝟓𝟒 (𝑼𝑲)} when you make the original booking.